[Bugs] [Bug 1420623] [RHV-RHGS]: Application VM paused after add brick operation and VM didn' t comeup after power cycle.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1420623



--- Comment #14 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/14419 committed in master by Atin Mukherjee
(amukherj at redhat.com) 
------
commit 1e2773cf1586b78c71e5b8adc24c6b65f065357c
Author: Krutika Dhananjay <kdhananj at redhat.com>
Date:   Tue May 17 15:37:18 2016 +0530

    features/shard: Fix EIO error on add-brick

    DHT seems to link inode during lookup even before initializing
    inode ctx with layout information, which comes after
    directory healing.

    Consider two parallel writes. As part of the first write,
    shard sends lookup on .shard which in its return path would
    cause DHT to link .shard inode. Now at this point, when a
    second write is wound, inode_find() of .shard succeeds and
    as a result of this, shard goes to create the participant
    shards by issuing MKNODs under .shard. Since the layout is
    yet to be initialized, mknod fails in dht call path with EIO,
    leading to VM pauses.

    The fix involves shard maintaining a flag to denote whether
    a fresh lookup on .shard completed one network trip. If it
    didn't, all inode_find()s in fop path will be followed by a
    lookup before proceeding with the next stage of the fop.

    Big thanks to Raghavendra G and Pranith Kumar K for the RCA
    and subsequent inputs and feedback on the patch.

    Change-Id: I9383ec7e3f24b34cd097a1b01ad34e4eeecc621f
    BUG: 1420623
    Signed-off-by: Krutika Dhananjay <kdhananj at redhat.com>
    Reviewed-on: https://review.gluster.org/14419
    Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Atin Mukherjee <amukherj at redhat.com>

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